Circuit breaker



E. T; PLATZ CIRCUIT BREAKER Aug. 19, 1952 10 Sheets-Sheet l Filed Dec. 3. 1948 NVENTOR.

E. T. PLATZ CIRCUIT BREAKER Aug. 19, 1952 lO Sheets-Sheet 2 Filed Dec. 3. 1948 INVENTOR.

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INVENTOR.

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CIRCUIT BREKER INVENTOR.

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E. T. PLATZ CIRCUIT BREAKER Aug. 19, 1952 10 Sheets-Sheet 8 Filed Dec. 3, 1948 INVENTOR.

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INVENTOR.

E. T. PLATZ CIRCUIT BREAKER Aug. 19, 1952 lO Sheets-Sheet 10 Filed Dec. 3, 1948 INVENTOR. By 0% Patented Aug. 19, 1952 CIRCUIT BREAKER Elwood T. Platz, Detroit, Mich., assigner to Bulldog Electric Products Company, Detroit, Mich., a corporation of West Virginia Application December 3, 1948, Serial No. 63,410

(Cl. 20o-89) 16 Claims.

This application relates to circuit breakers, and particularly to circuit breakers having a control arrangement for connecting a manually operable handle or actuator to a contacter for opening and closing the circuit, with a latch whose automatic release automatically opens the circuit. The latch normally -inhibits opening movement except when the latter is caused manually, as by movement of the handle.

Itis a particular object of this invention to provide a novel form of control arrangement for such a manually operable circuit breaker.

It is a further object of the present invention to provide a circuit breaker wherein operation of the internal device that is responsive to over current conditions may be effected independently of the position of the external handle. This characteristic is sometimes referred to as tripfree operation."

A further object is to provide a circuit breaker which will automatically relatch itself following an over-current condition.

The invention may be embodied in numerous forms' Two such are shown in the drawings. In one embodiment, shown in Figs. 1-11 of the drawings, there is shown a circuit breaker having three poles, with magnetic latch trip means. Figs. 12-13 show a breaker having but one pole, with a bimetal or thermal latchv trip means.

For an understanding of the breakers herein disclosed, reference should be had to the appended drawings.

In these drawings:

Fig. 1 is a sectional plan view of the breaker of Figs. 1-11, as if on line I-I, Fig; 2.

Figs. 2, 3 and 4 are sectional elevation views taken on line 2-2 of Fig. 1, showing the breaker parts in various positions, as indicated.

Figs. 5, 6, 7, 8 and 10 are fragmentary views of certain operating parts. Y

Fig. 9 is a, sectional view as if on line 9--9 of Fig. 2.

Fig. 11 is a sectional View as if on line |l-| I, Fig. 2.

Fig. 12 is a sectional view of. a single pole embodiment of the invention.

Fig. 13 is a sectional View as if on line |3-|3, Fig. 12.

FIGS. 1-11 Referring to the drawings, it will be seen that Figs; 2 and ll show a base 40 at the left endA of which are mounted three terminal binding posts 42 connected by straps 43 to stationary contacts 44 adapted to be engaged by contact tips 46 of three vertically movable contactors 42 pivotally 2 mounted by means of loose or lost motion pivots 52 on mounting lugs 54 and constantly urged up or clockwise by biasing springs 5&3 and connected by flexible connectors 58 to three electro-magnetic tripping coils 62 connected to three binding screws 56.

A transverse axle 68, suitably insulated from them, connects` the three contactors 48Y so that they may operate in unison in response to the control arrangement, generally referred to as A, Fig. 2, which will now be described.

The control arrangement includes a U-shaped frame member l2, best shown in Figs. 5, 6 and 9, which is mounted on the base 40 by screws 13 and which has alined openings 'I4 through which passes a horizontally disposed movable shaft or Apin l5, shown in Fig. l0, which also passes through camming slots '16 of a horizontally disposed latching arm '18, shown in Fig. 8, pivoted in the frame 'I2 at 19. Horizontal pin 15 also passes, through a vertical slot 30 in a vertically disposed forked lever or actuating element 82 to which is integrally, connected an operating shaft 83- in turn connected to a handle 84, through a quick'make and break torsion spring 85. Forked lever 82 is mounted to rotate in a circular path as the handle 84 is moved horizontally, so that the lower end of lever 82 moves horizontally, and its rotation is limited by a lug 86 projecting down into an arcuate slot 8l cut out in the top portion of theA frame l2, as shown in Figs. l and 6.

Axle 68which passes through and connects the three contactors 48 also passes through vertically slotted portions of the frame 72, as shown in Fig. 5, and' is operatively connected to the lower end of a vertically arranged actuated element 98.011 whose upper end is the horizontal pin l5.

Latchingarm '18' is latched atan end by a latching bar |08, Fig. 8, which is journalled at its ends in the frame l2, Fig. 6, and has immovably fastened to it, as by screws at the ends of latch bar |08, a trip 'oar |09 of insulation. Loosely coiled around the latching bar |08 is a coil spring, not shown, tending to bias the assembly |08|09 counterclockwise, Fig. 2, to latching position. Loosely hooked around the edge of thev trip bar |09 are three armatures H0, Fig. 2, for the three tripping electro-magnets E2. Armatures ||0 are pivotally mounted on lugs 54 at H2, and are normally biased upwardly by springs H4. Latching bar |08 has a notch |30 which cooperates with the latched end |3| of la'hing arm 18 for releasing the latching arm 1.8, and the pin 15, and thus the mechanism as a whole.

When the latching bar |08 is in its latching position, Fig. 2, the latch extension |3| of the latching arm 18 is held up and prevented from moving down by the latch bar |08. In this way arm 18 is held immovable and thus holds pin 15 immovable and prevents the actuated element 96 and the contactors 48 from moving up unless the handle 84 is rotated.

However, when any trip magnet 62 is energized, it pulls down its armature |'|0 and rocks the trip bar |09 to rock the latching bar |08 clockwise to present notch of the bar |08 to the end |3| of the latching arm 18, releasing the latter and permitting it to be free to be rocked clockwise on its pivotal axis 19. The freed arm 18 no longer holds the pin 15 immovable andpermits the lifting of pin 15 and the element 96 and the contactors 48 by springs 56, without the actuating element 82 and the handle 84 being required to rotate, a trip free action.

A relatching and actuator returning spring |32 connects arm 18 at |33 to frame 12 at |34, and at |35 is shown a stop for limiting movement of arm 18 counterclockwise under the bias of such spring |32.

It will be noted that pivot 19 of .arm 18 is nearer pin 15 than latch bar |08, so as to minimize latch pressure at |3|-|3| to be small in relation to the pressure of pin 15 on arm 18.

The circuit The circuit from a terminal 42 to a binding post 66 includes the following parts: 42-43-44- 46-48-58-62-66.

Operation A. When the parts are in the on or closed circuit position, as shown in Fig. 2, and with arm 18 releasably latched at |30-|3| by the latching bar |08, the horizontal pin 15 rests in the lower and horizontal portions 16a of the slots 16 of the arm 18. Thus the parts are held stable in the on position despite the bias of the springs 56 tending to move the contactors 48, the element 96 and, therefore, the horizontal pin 15 upwardly. l

Since, for upward movement of the contactors 48, the horizontal pin 15 must move up, and since the pin 15 is held against such movement by arm 18 at 16a, the contactors 48 are held in the circuit closed position, against the biasing ofA springs 56 which bias them to the open circuit position.

B. When the handle or actuator 84 is rotated clockwise, as shown in Fig. 1, to the o position, the connection between it and the actuating element 82, established through the torsion spring 85, Icauses the lower end of element 82 and the horizontal pin 15 to move to the left, Fig. 2, with a quick break or snap action. Pin 15 is guided by the upper edge 1Gb of slot 16 of arm 18. As pin 15 moves to the left,V springs 56 raise the contactors 48 to open the circuit. A

Projection 86 of forked lever 82, Fig. 6, moving in a curved slot 81 in the top part of the frame 12 limits the extent of movement of the forked lever 82 and, therefore, the travel of the handle 84 as well as the horizontal pin 15. The latter is also stopped by the left lend 16o of slot 16 in arm 18. Arm 18 cannot move since. it is releasably held up by the latching bar |08.

When the handle 84 is returned to the on position, Fig. 2, from the off position, Fig. 4, the forked lever 82 will be rotated counterclockwise, and in doing so will cause the horizontal pin 15 .presented to the end |3| of the arm 18.

1frame:12, and no longer holds pin 15.

to move laterally to the right and down in the slot 16 of arm 18, with a quick make or Snap action. In doing so the pin 15 will move the element 96 to the right and down, moving the contactors 48 back to the stationary contacts 44 and thus closing the circuit. All parts are now in the circuit closed position.

C. In the event of an overload in any pole, with the parts in the closed circuit position, the electro-magnet 62 of the overloaded pole will be energized to move its armature ||'0 down and thus move the trip bar |08 down to rotate the latch bar |08 so that notch |30 of the latch bar |08 is Arm 18 is now free to pivot about its pivot 19 on the Springs 56 now move contactors 48 up. Element 96, which is xed'to the contactors 48 through the axle 58 will also move up, and in doing so will move the horizontal pin 15 up in the cut-out portion 80 of the forked lever 82. The horizontal pin 15 will rock arm 18 clockwise about its pivot 19 and the latching end |3|, which is no longer releasably held by the latch bar |08, will pass down past notch |30 of latch bar |08, as the portion of arm 18 containing the slot 16 will move up with the horizontal pin 15. v

Automatic relatchzng and actuator resetting The latch return and actuator. return spring |32, Fig. 5, thereupon exerts its influencey on the arm 1S to rotate itA counterclockwise about its pivot 19 to raise the latch end |3| of the arm 18 and at the same time to lower the slotted end of the arm 18. Latch end Blof the arm 18 will rise until it is stopped by stop |35 of the frame 12. The slotted end of the arm 18 which contains the lateral pin 15 will bemoved down. The upper edge of slot 16 will now cam pin 15 down and to the left, to the position of Fig. 4. Meanwhile the deenergized electro-magnet 62 will have allowed the armature ||0 to move .up and release thetrip bar |09 to the action of the coil spring, not shown, which rotates the trip bar |09 and latchrbar |08 so that the latch at |30- |3| is reestablished. The movement terminates with the partsin the open circuit position and the arm 18 releasably relatched by thel latch bar |08.

The actuating element 82 and the handle 84 meanwhile have been moved from the on to the off position due to thevmovement of pin 15 to the left responding to the influence of the latch return spring |32. All'parts are now in the off position.-

4 FIGS. 12L13 Although the invention has been shown in Figs. 1-11 ina three-pole embodiment, it is to be understood that'it could just as easily have been embodied in a single-pole embodiment. To do thisV would merely require the shortening of the axle 68 as clearly shown in Fig. 13. The function of the breaker and the operation of the control arrangement would be exactly the same whether this breaker'I be single-pole or threepole.

It is also to be understood that the means for controlling the latch bar |08 and trip bar |09 can either be electro-magnetic, as shown in .'Eigs 1-11, inclusive, or thermal or bimetal warping means, as shown in Figs. 12 and 13. Trip bar |09, which is normally urged upwardly by la coil spring, not shown, cooperates withra thermal bimetalstrip 2|0 and hook .2||, Figs. 12 and 13,

whexran overload occurs to release the-latch at Now having described the circuit breakers herein disclosed, reference should be hadv to the claims which follow for a determination of the invention.

' I claim:

1. In a circuit breaker, an actuating element mounted to have its lower end move in a given plane, and having its'lower end slotted, an actuated' element having its upper end provided with a pin passing through said slot of the actuating element, and mounted to have its lower end reciprocate but its upper end reciprocate and move arcuately, a spring for upwardly biasing the fi actuated element, a contacter operatively connected to' said actuated element and arranged to move to open circuit position as the lower end of said actuated element moves upwardly, and

to return to closed circuit position as such endv moves downwardly. and a latching arm pivotally mounted between its ends and releasably latched at one end and having a slot at its other end receiving said pin, the endV of the latching arm slot nearer the pivot forming an abutment for holding said pin in its circuit closed position, and the edge of the latching arm slot providing a track to guide the movement of said pin to and from said end of the latchingv arm slot, and yalso providing a means whereby movement of ysaid pin under bias of said spring upwardly in the slot of the actuating element, due to release of said latching arm by its latch, causes Said latching arm to rock on its pivot out of its pin holding position, and also providing a means whereby movement of said latching arm back to its pin holding position after movement 'of said arm due to movement of said pin out of arm-held position causes said pin to move to circuit open position, and means for holding said pin in its circuit open position.

2. In a circuit breaker, an actuating element mounted to have its lower end move in a given plane, and having its lower end slotted, an actuated. element having its upper end provided with a pin passing through said slot ofthe actuating element, and mounted to have its lower en d reciprocate but its upper end reciprocate and' move arcuately, a spring for upwardly biasing the actuated element, a contactor operatively connected to said actuated element and arranged to move to open circuit position as the lower end o said actuated element moves upwardly, and to return to closed circuit position as such end moves downwardly, and a latching arm pivotally mounted between its ends and releasably latched at one end and having a slot at its other end receiving said pin, the end of the latching arm slot nearer the pivot forming an abutment for holding said pin in its circuit closed position, and the edge of the latching arm slot providing a track to vguide the movement of said pin to and from Said end of the latching arm slot, and also providing a means whereby movement of said pin under bias of said spring upwardlyin the slot ofthe actuating element, due to release of said 'latching arm by its latch, causes said latching ann to rock on its pivot out of its pin holding position, and also providing a'means whereby movement of said latching arm back to its pin holding position after Amovement of said arm due to movement of said pin out of arm-held position causes said pin to move to a circuit open position, and means for holding said pin in its circuit open position, and a spring for moving said latching arm back to its pin holding position.

3. In a circuit breaker, an actuating element mounted to have its lower end move in a given plane, andl having its lower end slotted, an actuated element having its upper end provided with a pin passing through said slot of the actuating element, and mounted to have its lower end reciprocate but its upper end reciprocate and move arcuately, a spring for upwardly biasing the actuated element, a contacter operatively connected to said actuated element and arranged to move to open circuit position as the lower end of said actuated element moves upwardly, and to return to closed circuit position as such end moves downwardly, and a latching arm pivotally mounted between its ends and releasably latched at one end and having a slot at its other end receiving said pin, the end o the latching arm slot nearer the pivot forming an abutment for holding said pin in its circuit closed position, and the edge of the latching arm slot providing a track to guide the movement of said pin to and froml said end of the latching arm slot, and also providing a means whereby movement of said pin under bias of said spring upwardly in the slot of the actuating element, due to release of said latching arm by its latch, causes'said latching arm to rock on its pivot out of its pin holding position, and also providing a means whereby movement of said latching arm back to its pin holding position after movement of said arm due to movement of said pin out of armheld position causes said pin to move to a circuit open position, and means for holding said pin in its circuit open position, the slot in the latch- :lng arm having its end nearer the latching arm pivot considerably below the end more remote from the latching arm pivot.

4. In a circuit breaker, an actuating element mounted to have its lower end move in a given plane, and having its lower end slotted, an actuated element having its upper end provided with a pin passing through said slot of the actuating element, and mounted to have its lower end reciprocate but its upper end reciprocate and move arcuately, a spring for upwardly biasing the actuated element, a contacter operatively connected to said actuated element and arranged to move to open circuit position as the lower end of said actuated element moves upwardly, and to return to closed circuit position as such end moves downwardly, and a latching arm pivotally mounted between its ends and releasably latched at one end and having a slot at its other end receiving said pin, the end of the latching arm slot nearer the pivot forming an abutment for holding said pin in its circuit closed position, and the edge of the latching arm slot providing a track to guide the movement of said pin to and from said end of the latching arm slot, and also providing a means whereby movement of said pin under bias of said spring upwardly in the slot of the actuating element, due to release of said latching arm by its latch, causes said latching arm to rock on its pivot out of its pin holding position, and also providing a means whereby movement of said latching arm back to its pin holding position after movement of said arm due to movement of said pin out of arm-held position causes said p'm to move to a circuit open position, and means for holding said pin in its circuit open position, the slot in the latching arm having its end nearer the latching arm pivot considerably below the end more remote `from the latchingarm pivot, and a spring for moving said latching arm back to its pin holding position.

5. In a circuit breaker, an actuating element vmounted to have its lower end move in a given plane, and having its lower end slotted, an actuated element having its upper end provided with aA :pin passing through said slotof the actuating element, and mounted to have its lower end reciprocate but its upper end reciprocate and move arcuately, a spring for upwardly biasing .the actuated element, a contactor o-peratively connected to said actuated element and arranged to move to open circuit position as the lower end of said actuated element moves upwardly,

and to return to closed circuit position as such end moves downwardly, and a latching arm pivotally mounted between its ends and releasably latched at one end and having a slot at its other end receiving said pin, the ends of the latching arm slot providing twoabutments for holding said pin in its circuit closed and open positions, and the edge of the latching arm slot providing a trackior guiding the movement of said pin to and from theends of the latching arm slot, and also providing a means whereby movement of said pin under bias of said spring -upwardly in the slot of the actuating element due to the release of said latching arm by its latch, causes said latching arm to rock on its pivot out of its pin holding position, and also providing a means whereby movement of said latching arm back to its pin holding position after movement of said arm due to movement of Vsaid pin out of arm-held position causes said pin to move to a circuit open position, again held f to said actuated element and arranged to move to open circuit position as the lower end of said actuated element moves upwardly, and to return to closed circuit position as such end moves downwardly, and a latching arm pivotally mounted between its ends and releasably latched at one vend and having a slot at its other end receiving y said pin, the ends of the latching arm slot providing two abutments for holding said pin in its "Circuit closed and operi positions, and the edge fof the latching arm slot providing a track for guiding the movement of said pin to and from lthe ends of the latching arm slot, and also providing a means whereby movement of said pin under bias of said spring upwardly in the slot of the actuating element, due to the release of said latching arm by its latch, causes said latching arm to rock on its pivot out of its pin holding position, and also providing a means whereby movement of said latching arm back to its pin holding position after movement of said arm due to movement of said pin out of arm-held position causes said pin to move to a circuit open position, again held by an end of the latching arm slot, and a spring for moving said latchingarm back to its pin holding position.

7. In a circuit breaker, an actuating element mounted to have its lower end move in a given plane, and having its lower end slotted, an actu- 8 ated element having its upper end provided with a pin passing through said slot of the actuating element, and ,mounted to have its lower end reciprocate but its upper end'recipro'cat'e and move arcuately, a spring for upwardly biasing the actuated element, a contactor operatively connected to said'actuated element and arrar'iged to move to open circuit position as the lower end of said actuated element moves upwardly, and to return to closed circuit position as such end moves downwardly, and a latching arm pivotally mounted between its ends and releasably latched at one end and having a slot at its other end receiving said pin, the ends of the latching arm slot providing two abutments for holding said pin in its circuit closed' and open positions,r and the edge of the latching armv slot providing ja track for guiding the movement of said 4pin to and from the ends of the latching arm slot, and also providing a means whereby movementl of said pin under bias of said spring upwardly yin the slot of the actuatingelement due to the release of said latching armlby its latch, causes said latching arm to rock Von its pivot out of itsypin holding position, and also providing ameans whereby movement of said latching arm back to its pin holding position after movement of'v said arm due to movement of said pin out of arm-held position causes said pin to move to a circuit open position, again held by an end of the latching arm slot, the slot in the latching arm having its end nearer the latching arm pivot considerably below the end more remote from the latching arm pivot. l y

8. In a circuit breaker, an actuating element mounted to have its lower end move ina given plane, and having its lower end slotted, aneactuated element having its upper end provided with a pin passing through said slot of the actuating element, and mounted to have its lower ejdreciprooate but its upper end reciprocate andmove arcuately, a spring for upwardly biasing the actuated element, a contactor operatively connected to said actuated element and arranged to move to open circuit'position as theA lower end of said actuated element moves upwardly, and to' return to closed circuit position as-such end moves downwardly, and a latchingarm pivotally mounted between itsends and releasablylatched at one end and having a slot vat its other'end receiving said pin, `the Yends'of the-latching arm slot providing two abutments for holdinggsaidpin in its circuit closed and open positions, and' the edge of the latching arm slot providing ar track for guiding the movement of said pin to and from the ends of the latching arm slot, and also providing a means whereby movement of' said pin under bias of said spring upwardly in the slotl of the actuating element, due to the releaseofsaid latching arm by its latch, causes said latching arm to rock on its pivot out of its pin holding position, and also providing a-means whereby movement of said latching arm back to itsA pin Vholding position after movement of said arm due to movement of said pin out of arm-held position causes saidpin to move to a circuit open position, again held by an end of the latching arm` slot, the slot on the latching arm having its end nearer the latching arm pivot considerably 'below the end more remote fromvthe latching arm pivot. and a spring for moving said latching arm' back to its pin holding position. f f

9. In a circuit breaker, Va vertically arranged actuating element mounted to have its lower -end move in a horizontal plane,l and havingY its lower end slotted in a vertical plane, an actuated element arranged in a vertical plane and having its upper end provided with a pin passing through said slot vof the actuating element, and mounted to have its lower end reciprocate but its upper end reciprocate and move arcuately, a spring for upwardly biasing the lower end of the actuated element, a contactor operatively connected to said actuated element and arranged to move to open circuit position as the lower end of said actuated element moves upwardly, and to return to closed circuit position as such end moves downwardly, and a latching arm arranged in a horizontal plane and pivotally mounted between. its ends and releasably latched at one end and having a slot at its other end receiving said pin, the end oi the latching arm-slot nearer the pivot forming an abutment for holding said pin Vin its circuit closed position, and the edge of the latching arm slot providing a track for guiding movement of said pin to and from said end of the latching arm slot, and also providing a means whereby movement of said pin under bias of said spring upwardly in the slot of the actuating element, due to release of said latching arm by its latch, causes said latching arm to rock 'on its pivot out of its pin holding position, and also providing a means whereby movement of said latching arm back to its pin holding position after movement of said arm due to movement of said pin out of arm-held position causes said pin to move to a circuit open position, and means for holding said pin in its circuit open position.

l0. In a circuit breaker, a vertically arranged actuating element mounted to have its lower end move in a horizontal plane, and having its lower end slotted in a vertical plane, an actuated element arranged in a vertical plane and having its upper end provided with a pin passing through said slot of the actuating element, and mounted to have its lower end reciprocate but its upper end reciprocate and move arcuately, a spring for upwardlyV biasing the lower end of the actuated element, a contacter operatively connected to said actuated element and arranged to move to open circuit position as the lower end of said actuated element moves upwardly, and to return to closed circuit position as such end moves downwardly, and a latching arm arranged in a horizontal plane and pivotally mounted between its ends and releasably latched at one end and having a slot at its other end receiving said pin, the end of the latching arm slot nearer the pivot forming an abutment for holding said pin in its circuit closed position, and the edge of the latching armvslot providing a track for guiding movement of said pin to and from said end of the latching arm slot, and also providing a means whereby movement of said pin under bias of said spring upwardly in the slot of the actuating element, due to release of said latching arm by its latch, causes said latching arm to rock on its pivot out of its pin holding position, and also providing a means whereby movement of said latching arm back to its pin holding position after movement of said arm due to movement of said pin out of arm-held position causes said pin to move to a circuit open position, and means for holding said pin in its circuit open position, and

a spring for moving said latching arm back to its pin holding position.

1l. In a circuit breaker, a vertically arranged actuating element mounted to have its lower end move in a horizontal plane, and having its lower end slotted in a vertical plane, an actuated element arranged in a vertical plane and having its upper end provided with a pin passing through said slot of the actuating element, and mounted to have its lower end reciprocate but its upper end reciprocate and move arcuately, a spring for upwardly biasing the lower end of the actuated element, a contactor operatively connected to said actuated element and arranged to move to open circuit position as the lower end of said actuated element moves upwardly, and to return to closed circuit position as such endy moves downwardly, and a latching arm arranged in a horizontal plane and pivotally mounted between its ends and releasably latched at one end and having a slot atits other end receiving said pin, the end of the latching arm slot nearer the `pivot forming an abutment for holding said pin in its circuit closed position, and the edge of the latching arm slot providing a track for guiding movement of said pin to and from said end of the latching arm slot, and also providing a means whereby movement of said pin under bias of said spring upwardly in the slot of the actuating element, due to release of said latching arm by its latch, causes said latching arm to rock on its pivot out of its holding position, and also providing a means whereby movement of said latching arm back to its pin holding position after movement of said arm due to movement of said pin out of arm-held position causes said pin to move to a circuit open position, and means for holding said pin in its circuit open position, the slot in the latching arm having its end nearer the latching arm pivot considerably below the end more remote from the latching arm pvot.

12. In a circuit breaker, a vertically arranged actuating element mounted to have its lower end move in a horizontal plane, and having its lower end slotted in a vertical plane, an actuated element arranged in a vertical plane and having its upper end provided with a pin passing through said slot of the actuating element, and mounted to have its lower end reciprocate but its upper end reciprocate and move arcuately, a spring for upwardly biasing the lower end of the actuated element, a contacter operatively connected to said actuated element and arranged to move to open circuit position as the lower end of said actuated element moves upwardly, and to return to closed circuit position as such end moves downwardly, and a latching arm arranged in a horizontal plane and pivotally mounted between its ends and releasably latched at one end and having a slot at its other end receiving said pin., the end of the latching arm slot nearer the pivot forming an abutment for holding said pin in its circuit closed position, and the edge of the latching arm slot providing a track for guiding movement of said pin to and from said end of the latching arm slot, and also providing a means whereby movement of said pin under bias of said spring upwardly in the slot of the actuating element, due to release of said latching arm by its latch, causes said latching arm to rock on its pivot out of its pin holding position, and also providing a means whereby movement of said latching arm back to its pin holding position after movement of said arm due to movement of said pin out of arm-held position causes said pin to move to a circuit open position, and means for holding said pin in its circuit open position, the slot in the latching arm having its end nearer the latching arm pivot considerably below the end more remote from the latching arm pivot,

and a'spring for moving said latching arm back to its pin holding position. v y

13. In a circuit breaker; a vertically arranged actuating element mounted to have its lower end move in a horizontal plane, and having its lower end slotted in a vertical plane, an actuated element arranged in a'vertical-plane and having its upper end provided with a pin passing through said slot of the actuating elementfand mounted to have its lower end reciprocate but its upper end reciprocate and move arcuately, aspringfor upwardly biasing the lower'end of the actuated element, a contactor operatively connected to said actuated element and arranged to move to open circuit position as the lower end of said actuated element moves upwardly, and to return to closed circuit position as suchend moves downwardly, and a latching arm arranged in a horizontal plane and pivotally mounted between its ends and releasably latched at one end and having a slot at its other end receiving said pin, the ends of the latching arm slot -providing two abutments for holdingsaid-pin in its circuit closed and open positions, and the edge of latching arm slot providing a track for guiding the movement of said pin to andfrom the ends of the-latching arm slot, and also ,providing a means whereby movement of said pin under -bias of said spring upwardly in the slot of the actuating element,

due to release of said latching arm by its latch,

of said arm due to movement of said pin out of arm-held position causes said pin to move to a circuit open position, lagain held .by an end of the latching arm slot. Y l

14. In a circuit breaker, a vertically arranged actuating element mounted to have its lower end move in a horizontal plane, and having its lower end slotted in a vertical plane, an actuated element arranged in a vertical plane and having its .upper end provided with a pin passing through said slot of the actuating element, and mounted to have its lower-end reciprocate but its upper end reciprocate and move arcuately, a spring for upwardly biasing the lower end of the actuated element, a contactor operatively connected to said actuated element and arranged to move to open circuit position as the lower end ofA said Yactuated element moves upwardly, and to return to closed circuit position as such end moves downwardly, andl a latching arm arranged in a horizontal plane and pivotally mounted between its ends and releasably latched at one end and having a slot at its other end receiving'said pin, the ends vof the latching arm slot providing two abutments for holding said pin in its circuit closed and open positions, and the edge of latching arm slot providing a track for guidingthe movement of said pin to and from the ends of the latching arm slot, and also providing a means whereby movement of said pin under bias of said spring upwardly in the slot of the actuating element, due to release of said latching arm by its latch, causes said latching arm to rock on its pivot out of its pin holding position, and also providing a means whereby Y movement of said latching arm back to its pin 12 slot, and a spring for moving said latching arm back to its pin holding position.

15. In a circuitl breaker, a `vertically arranged actuating element mounted to have its lower end move in a horizontal plane, and having 'its lower end slotted in a vertical plane, an actuated element arranged in a vertical plane and having -it's upper end provided with a pin passing through said slot of the actuating element, and mounted to have its lower end Areciprocate but its upper end reciprocate and move arcuately, a spring for upwardly biasing the lower end of tthe actuated element, a contactor operatively connected to said actuated element and arranged to move to open circuit position as the lower end -of said actuated element moves upwardly, and to return to closed circuit position as such end moves downwardly, and a latching arm arranged inra horizontal plane and pivotally mounted between its ends and releasably latched at one end and having a slot at its other end receiving said pin, the ends ofthe latching arm slot providing two abutments for holding said pin in its circuit closed and open positions, and the edge of latching -arm slot providing a track for guiding the movement of said pin to and from the ends of the latching arm slot, and also providing a means whereby movement of said pin under bias of said spring upwardly in the slot of the actuating element, due to release of said latching arm by its latch, causes said latching arm to rock on its pivot out of its pin holding position, and also providing a means whereby 'movement-of said latching arm back to its pin holding position after movement of said arm due to movement of said pin out of arm-held position causes said pin to move to a `circuitto open position, again held by an end of the latching arm slot, -the slot in the latching arm having its end nearer the latching arm pivot considerably below the end more remote from the latching armpivot.

16. In a circuit breaker, a vertically arranged actuating element mounted Yto have itsv lower end move in a horizontal plane, and having itsflower end slotted in a vertical plane, an actuated element arranged in a verticalplane and having its upperl end provided with a pin passing'through said slot of the actuating element, and mounted to have its lower end reciprocate but its upper end reciprocate and move arcuately, a spring for upwardly biasing the lower end of the actuated element, a contactor operatively connected to said actuated element and arranged to move to open circuit position as the lower end of said actuated element moves upwardly, and to return to closed circuit position as such end moves downwardly, and a latching arm arranged in a horizontal plane and pivotally mounted between its' ends and releasably latched at one end and having a slot at its other end receiving said pin, the ends of the latching arm slot providing two abutments for .holding said pin in its circuit closed and open positions, and the edge of latching arm slot providing a track for guiding the movement of said pin to and from the ends of the latching arm slot, and also providing a means whereby movement of said pin under bias of said spring upwardly in the slot of the actuating element, due to release of said latching arm by its latch, causessaid latching'arm to rock on its pivot out of its pin holding position, and also providing a means whereby movement of said latching arm back to its pin holding position after movement of said arm due to movement of said pin out of arm-held position causes said pin to move to a circuit open position, again held by an end UNITED STATES PATENTS o! the labching arm slot. the slot in the latching Number Name Date am having its end nearer the latchins arm pivot 1,761,117 Getchen June 3, 1930 considerably below the end more remote from 1,952,040 Frank et a1 Mar, 20, 1934 the latching arm pivot, and a spring for moving 5 2,103,070 Frank Dec. 21, 1937 said latching arm back to its pin holding position. 2,160,236 Taylor May 30, 1939 ELWOOD T PLATZ- 2,270,150 Taylnr Jan. 13, 1942 REFERENCES CITED 2,354,157 Swingle July 13, 1944 The following references are of record in the 10 ille of this patent: 

